Samuel l



( No Modl.) t

' .A S. L. WESTLEY '8a' B..P. KRAFT.-

BALANGED VALVE.

No. 264 588. u Patented Sept. 19, 1882.

ffii' n. Punks. mummy. www n c UNITED- STATESl PATENT OFFICE. l

SAMUEL I.. wEsTLEY ANI) BENJAMIN F. KRAFT, 0F READING, FA.

Y BALANci-:D VALVE..

SPECIFICATION forming part of Letters Patent No. 264,588, dated September 19, 1882.

Application filed March 18, 1882. (No model. v

To all whom, @t mayconcern: y Be it known that we, SAMUEL L. WESTLEY and BENJAMINF. KRAFT, both/of the city of Reading, county ot Berks, ,Stateot Pennsylvania, have invented a new and useful Improvement in Balance-Valves for Steam or Pressure Engines, of which the following is a specification. n, p

This invention relates more particularly-to the class of valves, cylindrical'iu form, which operate by oscillation upon their seats.

Referring to the drawings herewith, Figure l represents a side elevation of a steam-cylinder litted with our improvement. Fig. 2 represents a reverse view of Fig. 1. Fig. 3 is a sectional elevation. Fig. 4 represents a crosselevation from the piston-rod end ot' the cylinder; Fig. 5, detail view of the standard and sprIng. l 1 v l Like letters of reference indicate like parts. A represents the cylinder, provided with the usual steam and exhaust passages; B, the shell ofthe passages; C, the seat; D, a supplemental Seat bored to suit the valve, and provided with steam and exhaust ports, which, in their continuity through the same, correspond with the ports of similar character in the seat C 0f the cylinder, .as shown in all of the drawings.

D represents the adaptation of our improvement to engines already in use or built and for sale. In the construction of an original cylinder the seat D would be cast withand form an integral portion ot' the same, materially reducing the cost ot construction. E represents the valve, wjhich is circular in cross-section, andof sucient length to suit the ports ofV the engine, with an allowance at each end for bearing-surface; is provided with a hollow eccentric interior, F, ont'of which lead openings G G each side of the exhaust depression H, forming the steam ports or passages to the seat-D, as shown. It is' also provided with a solid spindle or sl1ai't,`E, at the valverod side, to which is attached an arm, E2, having a valve-rod pin, E3,at the opposite side or endof the valve. The spindle or shaft E4 is hollow for the admission ot steam or motive force, and is connected with the supply-pipe by a ground-joint and stuffing-box connection, asis usual with joints of this character;

l is the passage through the spindle or shaft for steam or motive force.

J J are stands at either endof the valve, serving as guides for the valve-spindle bear! ings L, the bearings resting upon the valvespindles.

y K represents elliptic or equivalent springs resting upon the above bearings; M,`a key, and N a gib forming a clamp to the stand and an upper bearing to the spring, the compression of which is adjustable by the drivingof the key. P is the usual exhaust.

The valve may be adj usted to the bed and adapted to operate. without the compressionsprings K, the spindles or shaftbeing held down byaclamp-bearingandadjusting-screws. We, however, give preference to the arrangement as shown, for the compression upon the valve Y being adjusted slightly in excess of the difference in force upon the valve, so as to retain it upon the seat. Then. any sudden access of pressure from confined water or other canse would, raise the valve against the reacting pressure of the springs, and thus relieve the cylinder and save breakage. By widening the bridges between the exhaust and the steam ports of the valve, lap Vcan be given and expansion carried to the same point as .with the ordinary D slide-valve. By a proper proportoning of the interiorl F to the exterior diameter of the-valve, the upward pressure on the same, tending to lift it from the seat, may be reduced to such an extent as to require but a slight pressure 4upon the bearings L to resist the movement, and the valve is practically balanced.'

1t will be apparent to an expert that our i111- provement is of more economical application to a new engine-cylinder than that of the ordinary D slide-valve. We dispense with the steamchest', its numerous bolts', and work of planing and fitting connected therewith, also the surfacing ot' the valve and seat, reducing the work to that ot' boring and turning-two of the most simple and accurate operations of the machineshops. Should repairs become necessary, the

seat is rehored and valve IIe-turned, when thev parts are in as good condition `for service as when originally h'tted. 1f worn too much to be corrected in this way, vthe valve is reduced still morein size, and has then shrunk upon it a sleeve or cylinder of proper size to lit the enlarged bore ot' the seat, ports being eut through the shell after it is in place upon the valve-body.

We are aware that we are not the tirst to use a hollow valve of circular exterior section resting in a concave seat adapted to the same, steam being admitted to the interior of the valve through a hollow spin dle-eonneeted there` with, (see Patent No. 130,506, August 13, 1872, H. P. Jones;) but we believe ourselves to be the tirst to construct such valves in the manner shown and described, and therefore We desire to seenre by Letters Patent the following claims:

l. The steam-valve E, having an eccentric cavity, F, with steam-passages G Gr leading therefrom, an external depression, H, for exhaust, asolid shaft or spindle, E', provided with an arm, E2, and connecting-rod pin E3 on one end, and at the opposite end a tubular shaft or spindle, E4, having a ground-joint terminus, the passage I through the shaft be ing provided for the motive force, and in coinbination with the seats D and C,-eylinder A, standards J J, bearings L, springs K, and gibs and keys N M, substantially as shown, and for the purpose described.

2. In combination with a valve, as described and claimed, the su pplemental seat D, adapted by boring to the valve E, and provided with steam-passages G G and exhaust-passage H', whereby it is adapted to be applied to cylinders of engines already built and in use, in combination with the standards J J, bearings L, springs K, and gibs and keys N M, substantially as and for the purpose set forth.

3. The standards J J, with their keys M and gibs N, in combination with the springs K, bearings L, valve-shafts E E, and seat C ot" cylinder A, substantially as and for the purpose specified.

4. The single-leat'ed elliptic springs K, eonstruetcd, as shown, with female groove K and male tongue K2, in combination with bearings L, valve-shafts E E, valve E, seat D, cylinder A, and the standards J J7 substantially as shown and described.

SAMUEL L. WESTLEY. BENJ. F. KRAFT.

Witnesses:

F. PIERCE HUMMEL, THOMAS P. KINsEY. 

